Qingdao Edition Third Grade Science Volume 2

Description

Qingdao edition third grade science volume 2, car movement PPT courseware

Part One: Give it a try

Try it: How to make the car in your hand move?

Do it:

Requirements: Teammates at the same table should cooperate to complete the illustrated actions and feel the existence of push and pull.

group discussion

What other objects can be set in motion by push and pull? What other activities require the use of push and pull forces?

Car movement PPT, part 2: experiment

The relationship between the speed of the car's movement and the magnitude of the push and pull forces

Experimental equipment: timer, trolley, ruler, hook code, cotton thread.

experiment procedure:

1. Use the pulling force of 1 hook code to test the time it takes for the trolley to travel a distance of 90 cm.

2. Use the pulling force of 3 hook codes to test the time it takes for the trolley to travel a distance of 90 cm.

3. Use the pulling force of 5 hook codes to test the time it takes for the trolley to travel a distance of 90 cm.

Notes: The team has a clear division of labor and good observation records. Each set of experiments was performed at least three times to ensure the accuracy of the experiment.

Car motion PPT, part 3: experimental conclusion

My conclusion:

The speed of the car's movement is related to the amount of force. If you want the car to move fast, you must use a relatively large force. If you use a relatively small force, the car will move slowly.

Think about it:

During the experiment, which conditions remained unchanged and which conditions needed to be changed?

What remains unchanged: A. The weight of the car; B. The distance traveled by the car.

What needs to be changed: the amount of pulling force on the trolley (i.e. the number of hooks)

The factors that can be changed in the experiment are collectively called variables, such as the weight of the trolley in the experiment, the distance traveled by the trolley, the number of hook codes, etc. The factors that are artificially changed are called adjustment variables, and the number of hook codes is the adjustment variable. The factor that changes as the regulating variable changes is called the strain variable, which is the time it takes for the car to pass a certain distance. An experiment in which all factors are kept constant except one is called a comparative experiment.

Car Movement PPT, Part 4 Content: Classroom Assessment

Classroom Assessment:

1. Pushing and pulling both produce ______. Pushing and pulling forces both cause objects to ______. Push and pull forces are also ______ and ______.

2. Talk about a child wearing roller skates who pushes against a wall. Why does it make him retreat?

Reference answer:

2. Answer: Push the wall with your hands. Since the forces are mutual, the wall will also push the child, causing the child to retreat.

free time:

The group discussed after class and designed an experiment in which thrust affects the speed of the car.

Keywords: Qingdao version third grade science PPT courseware for the second volume is free to download, the movement of the car PPT download, .PPT format;

For more information about the "Motion of Car" PPT courseware, please click on the "Movement of Car" ppt tab.

"Motion of Cars" PPT courseware download:

Download the PPT courseware of the movement of the car. Think about it: What methods can you use to make this car without any power device move? Watch and think: 1. What will happen to the objects that are pushed and pulled in the picture? 2. What are the effects of changes in objects? ... ....

"Motion of Cars" PPT download:

Qingdao version of the third grade science in the second volume, the movement of the car PPT download, the first part of the content: classroom experiment hands-on experience using a small rope to pull the car to move on the table, the other end of the small rope is tied to a washer, change the number of washers, feel the gravity, by The pulling force generated by the gravity of the washer..

"Motion of Car" PPT:

Qingdao version of the third grade science volume 2, the movement of the car PPT, the first part: the movement of objects. How to make objects move? Pushing and pulling both create forces, and pushing and pulling both cause objects to move. Push and pull forces also have magnitude and direction. The motion of the car and...

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Update Time: 2024-10-19

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